i wouldn't 'force' them this year, allow them to settle down and grow well in 2022.
then next year you could cover one/two to get pinker sweeter stems.

I agree with Eileen. I don't grow rhubarb, but my plants always do better when I leave them to sort themselves out.

Thanks very much Eileen ? Will of course do as you say, thanks too B. Must be a problem with my ipad which tells me my question went in 3 pieces

yes I am Eileen. That is odd Hank, but I don't have an i-pad so I wouldn't know.

The following year only cover/force one crown then the next do another one etc so that you don't weaken the plants.

I noticed Bathgate refer to you as Eileen, don’t worry, I forget things rapidly.

I tend to stick to the names under the avatar as I also struggle to remember names, Hank. I blame being a teacher and having to learn upwards of 280 names every year.

S.G. I too was a teacher, but fortunately had only about 20 names to remember

that was lucky. I taught secondary and the kids came to us for an hour lesson then moved on to another subject. Most classes were 30 pupils give or take.